Duplicating machine



w. F. SCHOENHARDT Jan. 7, 1941.

DUPLICATING MACHINE Filed May 19, 1939 6 Sheets-Sheet l Jan. 7, 1-941.w. F.- SCHOENHARDT DUPLICATING MACHINE Filed May 19, 1959 6 Sheets-Sheet2 a Sheets-Sheet 5 DUPLICATING MACHINE Filed May l9, 1959 w. F.VSCHOENHIARDT Jan. 7,1941

Jan. 7, 1941. w ESCHOENHARDT DUPLICATING MACHINE 6 Sheets-Sheet 4 7Filed May 19. 1939 7, 9 w. F. ISCHOENHARDT DUPLICA'IINGv MACHINE FiledMay 19, 1959 6 Sheets-Sheei: 5

Patented Jan. 7, 1941 UNITED STATES PATENT OFFICE DUTLICATKNG MACHINE ofWest Virginia Application May 19, 1939, Serial No. 274,583

1'7 Claims.

This invention relates to duplicating apparatus of the type in which thereading matter or other design to be duplicated is carried in reverse ona master copy such as the usual gelatin band mounted about a drum. Copysheets are fed to the drum and pressed by an impression roller or plateninto operative engagement with the band as the drum rotates for printingsuch copy sheets.

It is the object of the present invention to provide an improved formand arrangement of the parts in apparatus of the type described wherebyimproved results may be obtained. 7

The invention is directed particularly to the mechanism whereby, as thedrum rotates, the

sheets are fed one at a time to the drum and brought into the properadjusted position with respect to the design on the gelatin band forproviding the desired margins on the printed sheet. The apparatusembodies mechanism whereby sheets are fed from a stack directly intoposition to be engaged by the gelatin band as the drum rotates. Theapparatus embodies also means by which the sheets are stripped from thegelatin band and control means for the feed and stripping mechanismswhereby, at the will of the operator, a sheet may be applied to thegelatin band and caused to pass a plurality of times between the drumand the platen roller, and the platen roller may be moved into and outof operative position with respect to the drum.

It is another object of this invention to provide improved apparatus ofthe character described whereby to simplify the operation of feeding andpositioning sheets with respect to a duplicating drum and a platenroller.

The features and advantages of the present invention will appear morefully as the description proceeds, reference being had to theaccompanying drawings wherein a preferred form of the invention isshown.

In the drawings,

Fig. 1 is a View in side elevation of the improved apparatus with theend frame thereof broken away;

Fig. 2 is an enlarged fragmentary sectional view taken on the line 2-2of Fig. 1;

Fig. 3 is a top plan view of the apparatus shown in Fig. 1, with certainof the parts partially broken away so as to be shown in horizontalsection;

Fig. 4 isan end view partly in section, taken substantially on the line44 of Fig. 1; V

Fig. 5 is an enlarged view in side elevation, similar to Fig. 1, showingonly a portion of the mechanism at the right-hand end of Fig. 1 andshowing the parts in a changed position;

Fig. 6 is a fragmentary view similar to Fig. 5, illustrating a furtherchanged position of the parts;

Fig. 7 is a fragmentary sectional view taken on the line 'l! of Fig. 6;

Fig. 8 is a fragmentary sectional View taken on the line 8--8 of Fig. 6;

Fig. 9 is a fragmentary sectional view taken on the line 9--9 of Fig. 6;

Fig. 10 is a fragmentary sectional View taken on the line llll 0 of Fig.3;

Fig. 11 is a fragmentary sectional view similar to Fig. 10, showing theparts in a changed position, and

Fig. 12 is a further fragmentary view similar to Fig. 10, but showinganother position of the parts.

Referring now to the several figures of the drawings, in whichcorresponding parts are indicated by the same reference characters,indicates a frame which in the arrangement shown comprises standards 3!and 32 oppositely arranged (see Figs. 3 and 4) supporting a drum 33 bymeans of two short aligned shafts 34 and 35. The drum 33 is segmental inform as is usual in connection with gelatin-process duplicatingmachines, being provided with suitable mounting means of any approvedtype, as is indicated diagrammatically in Fig. 1, for mounting a gelatinband 36 about the face portion of the drum, the drum at the leading andrear edges of the face portion being provided with rollers 31 forengaging the gelatin band (see Figs. 1, 10 and 11). 35 The arrangementis such that the gelatin band 36 can be shifted as desiredcircumferentially of the segmental face portion of the drum.

Means is provided for driving the drum 33, as is best shown in Figs. 1and 3, comprising a drive 40 pulley 38 connected by means of a belt 33with any suitable source of power, said pulley 38 being rotatablymounted upon the standard 3| of the frame by means of a short stub shaft40. The pulley 38 is provided at one side face with a pinion 4l rigidlyconnected therewith in position to mesh with a large gear 42 rotatablymounted upon the short shaft 34 by means of a collar 43. The gear 42 inturn is provided on its outer face portion With a ratchet wheel 44 whichis adapted to-be engaged by a pawl 45 pivotally mounted upon theadjacent face of a large gear 46 fixedly mounted upon the shaft 34 so asto rotate with the drum 33. No means is shown in the drawings forcontrolling the position of the pawl 45 by which power may betransmitted from the gear M to the gear 46. Control means of anyapproved type is to be employed as is well understood in the art forregulating the position of the pawl 55 in accordance with therequirements. Such control means are not shown since they form no partof the present invention.

Upon the opposite end of the drum from that at which the gear 46 ismounted thereon, I have provided three cams 41, 48 and 49, rigidlymounted upon the drum so as to rotate therewith for purposes ashereinafter described.

At the rear end of the machine (see Figs. 1 and 4) I have providedextending frame bars 52 connected with parts 50 and 5! of the framework30 for supporting a table 53 thereon, together with means for feedingthe topmost sheet from a pile of copy sheets resting on the table. .Atopposite sides of the table, operating mechanism is provided inconnection with the feed of the sheets from the table. As is clearlyshown in Fig. 4, the table 53 is preferably provided with adjustableside margin bars 54 and 55 at opposite sides of the table for holdingthe sheets in evenly piled relation to each other. In the arrangementshown, the margin bars 54 and 55 are held in frictional engagement withthe table 53 by means of coiled springs 56, the arrangement being suchthat the margin bars are readily movable inwardly and outwardly withrespect to each other to correspond with the width of the sheets beingused.

The means for feeding to the drum the topmost sheet from a pile ofsheets supported by the table 53 comprises means intermittently drivenin timed relation to the rotation of the drum 33. This means comprises abell-crank lever 51 pivotally mounted upon the standard 32 by means of astub shaft 58. The bell-crank lever has a roller 59 rotatably mountedupon one of its arms in position to be engaged by the cam 49 at apredetermined point in each rotation of the drum 33. The other arm ofthe bell-crank lever 51 is connected by means of a link 66 with thelower end of an arm 6| which is pivotally mounted upon the adjacentframe member 52 at one side of the table 53. The arrangement is suchthat as the drum 33 rotates in clockwise direction to the position asshown in Fig. 1, the roller 59 and the bell-crank lever 51 are displacedin counterclockwise direction in said Fig. 1 for swinging the arm 6!also in counter-clockwise direction in said figure. A coiled spring 62connected between a pin 65a on the movably mounted arm 6| and a collar56a on the shaft 58 serves to swing the movably mounted arm 6! inclockwise direction as soon as the cam 49 has cleared the roller 59 forpermitting such result. An eccentric stop device 66 is adjustablymounted upon the frame member 52 in position to engage the edge of thearm 6! for limiting the movement of said arm in clockwise direction insaid Fig. 1.

At opposite sides of the table 53, I have provided standards 64 risingfrom the frame members 52 respectively for supporting a drive shaft inposition across the table in upwardly spaced relation thereto. In thearrangement shown (Figs. 1, 2 and 3), the drive shaft is built up from aplurality of parts, comprising a short shaft section 66 which isjournalled in a. bearing 65 carried by the upper end of one of thestandards 64, and a long sleeve member 68 removably mounted at one endon said shaft section 66 so as to rotate therewith. At its inner end,the sleeve member 68 is slidably mounted upon a shaft section 69 whichin turn is rotatably mounted in the side wall of a housing 79 ashereinafter described, the sleeve member 68 and the shaft section 69being connected so as to rotate together. By this arrangement, the shaft69 is caused normally to rotate with the shaft section 66, but the twoshafts are adapted very quickly and easily to be disconnected from eachother by a sliding movement of the tubular member 66 toward the housing.

The means for driving the shaft comprising the sections 66 and 69includes a pinion 16 operatively mounted on the shaft section 66 byclutch members 13, I4 and 15 So as to drive said shaft section in onedirection, said pinion '16 being in mesh with gear teeth 11 on the upperend of the pivotally mounted arm 6|. The arrangement is such that upon astroke of the arm 6| in counterclockwise direction in Fig. 1 the shaftis driven in clockwise direction.

The means for supporting the housing 10 in position comprises a sleeve Hrigidly connected at its inner end with one side wall of the housing 16in axial alignment with the shaft section 69. At its opposite end, thesleeve ll has a releasable connection T2 with the upper end portion ofthe adjacent standard 64. The arrangement of the shaft comprising thesections 66 and 69 and the connections of said shaft as above describedwith the housing I0 and sleeve H are such as to hold the parts stronglyin operative position during the operation of the machine. When theoperator desires, however, the shaft and connected parts can be veryquickly and easily removed from position. For accomplishing thispurpose, the sleeve 68 is first moved toward the housing I!) fordisengagement from the shaft section 66, and the whole assembly is thenmoved toward the near side in Fig. 3 for freeing the sleeve H from theframe.

Within the housing 10, in the arrangement shown, I have provided drivingconnections between the shaft section 69 and a short shaft 18 whichextends through the side walls of the housing 10 and has rollers 19 and89 fixedly mounted upon its outer end portions. The arrangement is suchthat when the shaft sections 66 and 69 are driven in clockwise directionin Fig. 1 by reason of an operative stroke of the arm Si incounter-clockwise direction, the rollers 19 and 86 are likewise drivenin clockwise direction in'said Fig. 1 for moving the topmost sheet of apile of sheets 8! (see Figs. 6 and 10) toward the left. Upon the returnmovement of the arm 6] by the spring 62, the free-wheeling connection asabove described permits the rotation of the pinion 16 with respect tothe shaft section 66 so as not to change the position of the rollers 19and 80.

In the arrangement as above described, the housing 10 serves as an armfor spacing the rollers 19 and 80 from the shaft section 69, such armetxending across above the table in spaced relation to the table, therollers 18 and 80 being held by their own weight in operative engagementwith the pile of sheets 8|. In case the operator should desire to movethe rollers 19 and 80 out of engagement with the pile of sheets, thiscan be accomplished by merely swinging the housing 10 and its connectedparts about the shaft section 69 and the sleeve ll so as to carry therollers 19 and 80 upwardly and backwardly past the axis of the shaftsection 66.

In Fig. 1 the roller 59 is shown in engagement with the cam 49 at theforward end of the operative stroke of the rollers 19 and 80 forforwarding a sheet of the pile toward the left in said figure. In Fig.5, in which the parts are shown in the changed position which theyassume upon a further advance movement of the drum from the position asshown in Fig. 1, the bell-crank lever 51 has been partially returned bythe spring 62 to starting position. The rollers I9 and 80, when rotatedin clockwise direction in Fig. 1, move the top sheet of the pile ofsheets BI into the position shown in Fig. 10. The sheet, in its advancemovement, is guided between a downwardly curved guide plate 82 on thetable 53 and an upper guide plate 83. The guide plate 83 is mounted upontwo raised portions 84 and 85 of the side frames 52. The upper edge ofthe guide plate 83 is turned up vertically, as shown as 85, so as not tointerfere with the positioning of the pile of sheets 8|. The plate 82 onthe table and the guide plate 83 provide a tapering throat which isadapted to direct a copy sheet over the surface of a platen roller 81into a margin bar 8111. The plate 82 ends directly over the platenroller 8! and is tangent to that part of the roller which is engaged bythe advancing gelatin band 35. The margin bar 8111 is in line with theplate 82.

The platen roller 81 is mounted upon two pivoted arms E8 and 89 (seeFigs. 4, and 6). The arms 88 and 80 are pivoted to the frames 52 by twopivot pins 90 and ill. The platen roller 81 has a shaft 92 which isjournalled in the arms 88 and 89. At the opposite ends of the arms 88and 89 from the shaft 92 pins 93 and 94 extend inwardly through twoslots 95 and 95 provided in the frames 52. These pins are connected tolinks 91 and 98 which are, in turn, connected to two arms 99 and I00fixed on a control shaft iii. The shaft IOI is journalled in suitablebearings I02 and I03 in the frames 52. Two collars IE4 and I 05 arefixed on the shaft Itl which is inside the bearings I02 and I03, and thearms 99 and I00 are mounted on these collars. The shaft IOI projectsthrough the left-hand frame 52, as shown in Fig. 4, and has a sleeve I25fixed thereon. A control lever I07 is secured to the sleeve I08 and hasa handle let thereon by which the shaft IOI may be rocked to swing theplaten roller 87 to and from the drum 33. A spring 03a is connectedbetween the arm 99 and a pin 99b on the frame 52 so as to yieldinglyurge the platen roller 81 toward the drum 33.

The shaft IiiI has a sleeve I00 rotatably mounted thereon at the end ofthe sleeve I05. This sleeve 809 carries a stripper control lever EIIJwhich is provided with a handle Ill. The stripper control lever I50 isconnected to a link I Hi! which leads to the stripper mechanism whichwill be presently described. A collar H3 is fixed on the end of theshaft I 0! to hold the sleeve H39 in place.

The margin bar 87a is carried by two arms I i4 and H5. The arms H4 andH5 are fixed to a margin bar shaft Iiii which is journalled in theframes 52. This shaft extends through the frames 52 and at one end isprovided with an arm Ii'i which connects to a spring H8 that is undertension between the arm and a pin H9 fixed on the right-hand framemember 52, as shown in Fig. 4. At the other end of the margin bar shafti it there is provided an arm I20 which carries a roller I2I adapted toengage the cam 48 (see Figs. 3, 5-7). As illustrated best in Figs. 5 and6, the cam 48 has a rounded nose portion i22 which strikes the rollerI2I at the instant the advancinggelatin band 30 reaches the platenroller 81' asshownfin Fig. 11 and immediately swings said roller I2I ina counter-clockwise direction about the shaft H5, as viewed in thesefigures. The: margin bar 8M is thus moved away from the forward'edge ofthe copy sheet held thereby to allow the copy sheet to follow thegelatin band and be pressed against the band on the drum by the platenroller 01. The arm III, which urges the margin bar into the positionshown in Figs. 5 and 10, has a flange I23 thereon which is adapted toengage an eccentrically mounted stop I24 on the frame 52. The stop I24is adjustable so as to vary the position of the margin bar with respectto the platen roller 0!- and control the length of margin left at theadvancing end of the copy sheet. The arm I20 can be adjusted on theshaft IIES by means of a slot I201; in the arm I20 and a screw I202)threaded into a collar IIfia on the shaft I I5 (see Fig. 7) forcontrolling the position of the cam roller I2I with respect to themargin bar 31a.

Referring now to the stripper mechanism which is shown most clearly inFigs. 1 and 3, the construction comprises a main stripping roller I25mounted on a. shaft I25 which is journalled in the side frames 3! and32. This shaft carries a pinion I2! that meshes with the gear 45 forrotating the roller i225 in counterclockwise direction in Fig. 1. Aguide roller 528 cooperates with the roller I25 to direct the advancingedge of a copy sheet outwardly from the drum upon a receiving tray I 29.The roller I23 is carried by two arms I30, and HM. These arms aresupported ,by a shaft I32 which is journalled in two studs I33 and I34mounted on the side frames 3I and 32. The shaft I32 carries two stop members I35 and I35 which are adapted to engage a cross tie rod I31 so asto limit the movement of the arms I30 and I3I and the roller 23 towardthe drum. A spring E38 (see Fig. 1) is connected to one end of a leverI3 which is fixed to the shaft I32. The other end of this spring isconnected to a pin 648 on the side frame 32. The purpose of the springI35 is to urge the shaft I32 and the arms I30 and I3I to turn in aclockwise direction so as to bring the roller I28 toward the drumsurface. The lever I35 carries a cam roller I4I which rides on the cam41.

The cam 41 is so shaped as to direct the roller I28 into the path of theadvancing edge of a copy sheet and then to move the roller outwardly soas to clear the advancing edge of the gelatin band. This movement of theroller I28 outwardly serves to bring the copy sheet into engagement withthe rotating roller I25 and to press the sheet against the roller forstripping the sheet from the drum. It is desirable in many instances tomaintain a sheet on the gelatin band for more than one rotation of thedrum. The link H2 is provided with means whereby the stripping mechanismwhich was just described may be rendered inoperative to strip a sheetfrom the drum. It will be noted that the link I I2, as shown in Fig. 1,has an elongated slot I42 which receives a guide pin I43 on the sideframe 32. The link H2 is bent outwardly at I44 (see Fig. 3) so as tofollow the frame 32 from the front end of the machine to the rearthereof. A bar I45 is mounted on the link I I2 and extends intooverlapping relationship with the spring connected end of the lever I39.Referring now to Figs. 1 and 3, if it is desired to render the strippingmeans inoperative, the lever H0 is pushed in a counter-clockwisedirection so as to move the link II2 to the right from the positionshown in Fig. 1. This will bring the screw I46 into engagement with thelever 139 and prevent the spring 138 from swinging this lever in aclockwise direction about the shaft I32. When the roller Ml rides off ofthe cam 41, the stripping roller 128 will still be held in the positionshown in Fig. 1 and will be inoperative to engage the advancing edge ofa copy sheet on the drum. Thus the sheet may be left on the drum for asmany rotations thereof as are desired.

The means for holding the platen roller 81 out of contact with the drumhave been previously described in detail. The operation of this means isbriefly as follows: Assuming that it is desired to prevent the platenroller from engaging the drum, for any purpose such as an inspection ofthe design on the gelatin band, the operator may move the platen rollercontrol lever H11 in a clockwise direction from the position shown inFigs. 1 and 3. This will swing the shaft l0! in a clockwise direction,causing the arms 99 and H10 and links 9! and 98 to turn the arms 88 and89 in clockwise direction and move the platen roller outwardly from thedrum. It is desirable to limit the movement of the platen roller towardthe drum, and for this purpose an eccentrically mounted stop I4! isprovided on the frame 52 in position to engage the end of the arm 88, asis shown in Fig. 6.

The operation of the sheet feeding mechanism and the margin bar is bestillustrated in Figs. 10, 11 and 12. In Fig. 10, the parts are in aposition where the copy sheet has been fed into the margin bar 81a andthe drum 33 is advancing to engage its gelatin band 36 with the copysheet. It is obvious that more or less margin may be left between thepoint of engagement of the sheet with the platen roller and theengagement of the sheet with the margin bar. This adjustment can be madeby means of the eccentric stop 124. The shortness of the margin islimited only by the necessary clearance between the platen roller andthe margin bar. In Fig. 11, the parts are shown at the instant when thegelatin band 36 engages the copy sheet. It is at this point that theforward end 122 of the cam 48 engages the roller l2l to move the marginbar out of the way. Since the cam 48 projects beyond the periphery ofthe drum, it will move the margin bar shaft enough to quickly separatethe margin bar from the advancing edge of the copy sheet. In Fig. 12,the margin bar is shown in its completely retracted positioncorresponding to the cam position for the cam 48 illustrated in Fig. 6.The margin bar is held in this position until the roller |2I approachesthe rear end of the cam 48 where the cam slopes inwardly to allow theroller I21 to gradually return the margin bar to its operative positionillustrated in Fig. 10.

While I have shown and described a preferred embodiment of my invention,it is to be understood that it is capable of many modifications.Changes, therefore, in the construction and arrangement may be madewithout departing from the spirit and scope of the invention asdescribed in the appended claims, in which it is my intention to claimall novelty inherent in my inven-. tion as broadly as possible, in viewof the prior art.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

I' claim:

1. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band, amargin bar, arms carrying said bar and pivoted in the frame to swing thebar into and out of operative position in the path of the platen beyondthe platen roll-er, a copy sheet table on said frame, a sheet guide onsaid table extending toward the drum and terminating directly over theplaten roller in close proximity to the path of the platen in positionto guide sheets across said roller to the margin bar and to contact thesheets with that part of the roller which lies in the path of theadvancing band on the drum, sheet feeding means for advancing sheetsfrom said table to the margin bar, and actuating means for said marginbar operable in timed relation with the drum to place the bar inposition to receive a sheet riding over said guide and said platenroller until the sheet has engaged the margin bar and has been pressedby the platen roller against the duplicating band and to thereafterremove the bar from the path of the platen.

2. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mount-ed in said frame inthe path of said band and adaptedto press sheets against the band, amargin bar, arms carrying said bar and pivoted in the frame to swing thebar into and out of operative position in the path of the platen beyondthe platen roller, a copy sheet table on said frame, a sheet guide onsaid table extending toward the drum and terminating directly over theplaten roller in close proximity to the path of the platen in positionto guide sheets across said roller to the margin bar and to contact thesheets with that part of the roller which lies in the path of theadvancing band on the drum, said sheet guide comprising upper and lowerplates directed diagonally downward and converging toward the drum,sheet feeding means for advancing sheets from said table to the marginbar, and actuating means for said margin bar operable in timed relationwith the drum to place the bar in position to receive a sheet ridingover said guide and said platen roller until the sheet has engaged themargin bar and has been pressed by the platen roller against theduplicating band and to thereafter remove the bar from the path of theplaten.

3., A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roll-er movably mounted in said frame inthe path of said band and adapted to press sheets against the band, amargin bar, arms carrying said bar and pivoted in the frame to swing thebar into and out of operative position in the path of the platen beyondthe platen roller, a copy sheet table on said frame, a sheet guide onsaid table extending toward the drum and terminating directly over theplaten roller in close proximity to the path of the platen in positionto guide sheets across said roller to the margin bar and to contact thesheets with that part of the roller which lies in the path of theadvancing band on the drum, sheet feeding means for advancing sheetsfrom said table to the margin bar, and actuating means for said marginbar operable in timed relation with'the drum to place the bar inposition to receive a sheet riding over said guide and said platenroller until the sheet has engaged the margin bar and has been pressedby the platen roller against the duplicating band and to thereafterremove the bar from the path of the platen, said actuating meanscomprising a cam fixed to the drum at one end thereof and a roller atone end of the margin bar to engage said cam.

4. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band,manually controlled means for moving the platen roller out of the pathof the band, a margin bar, arms carrying said bar and pivoted in theframe to swing the bar into and out of operative position in the path ofthe platen beyond the platen roller, a copy sheet table on said frame, asheet guide on said table extending toward the drum and terminatingdirectly over the platen roller in close proximity to the path of theplaten in position to guide sheets: across said roller to the margin barand to contact the sheets with that part of the roller which lies in thepath of the advancing band on the drum, sheet feeding means foradvancing sheets from said table to the margin bar, and actuating meansfor said margin bar operable in timed relation with the drum toplace thebar in position to receive a sheet riding over said guide and saidplaten roller until the sheet has engaged the margin bar and has beenpressed by the platen roller against the duplicating band'and tothereafter remove the bar from the path of the platen.

5. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band,manually controlled means for moving the platen roller out of the pathof the band, a margin bar, arms carrying said bar and pivoted in theframe to swing the bar into and out of operative position in the path ofthe platen beyond the platen roller, a copy sheet table on said frame, asheet guide on said table extending toward the drum and terminatingdirectly over the platen roller in close proximity to the path of theplaten in position to guide sheets across said roller to the margin barand to contact the sheets with that part of the roller which lies in thepath of the advancing band on the drum, sheet feeding means foradvancing sheets from said table to the margin bar, and actuating meansfor said margin bar operable in timed relation with the drum to placethe bar in position to receive a sheet riding over said guide and saidplaten roller until the sheet has engaged the margin bar and has beenpressed by the platen roller against the duplicating band and tothereafter remove the bar from the path of the platen, said actuatingmeans comprising a cam fixed to the drum at one end thereof and a rollerat one end of the margin bar to engage said cam.

6. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a. platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band, a

margin bar, arms carrying said bar and pivoted in the frame to swing thebar into and out of operative position in the path of the platen beyondthe platen roller, a copy sheet table on said frame, a sheet guide onsaid table extending toward the drum and terminating directly over theplaten roller in close proximity to the path of the platen in positionto guide sheets across said roller to the margin bar and to contact thesheets with that part of the roller which lies in the path of theadvancing band on thedrum, said sheet guide comprising upper and lowerplates directed diagonally downward and converging toward the drum,sheet feeding means 4 for advancing sheets from said table to the marginbar, and actuating means for said margin bar operable in timed relationwith the drum to place the bar-in position to receive a sheet ridingover said guide and said platen roller until the sheet has engaged themargin bar and has been pressed by the platen roller against theduplicating band and to thereafter remove the bar from the path of theplaten, said actuating means comprising a cam fixed tothe drum at oneend thereof and a roller at one end of the margin bar to engage saidcam.

'7. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band,manually controlled means for moving the platen roller out of the pathof the band, a margin bar, arm-s carrying said bar and pivoted in theframe to swing the-bar into and out of operative position in the path ofthe platen beyond the platen roller, a copy sheet table on said frame, asheet guide on said table extending toward the drum and terminatingdirectly over the platen roller in close proximity to the path of theplaten in position to guide sheets across said roller to the margin barand to contactthe sheets with that part of the roller which lies: in thepath of the advancing band on the drum, said sheet guide comprisingupper and lower plates directed diagonally downward and convergingtoward the drum, sheet feeding means for advancing sheets from saidtable to the margin bar, and actuating means for said margin baroperable in timed relation with the drum to place the bar in position toreceive a sheet riding over said guide and said platen roller until thesheet has engaged the margin bar and has been pressed by the platenroller against the duplicating band and to thereafter remove the barfrom the path of the platen.

8. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band, amargin bar, arms carrying said bar and pivoted in the frame to swing thebar into and out of operative position in the path of the platen beyondthe platen roller, means to adjust the operative position of said bartoward and away from said platen roller, a copy sheet table on saidframe, a sheet guide on said table extending toward the drum andterminating directly over the platen roller in close proximity to thepath of the platen in position to guide sheets across said roller to themargin bar and to contact the sheets with that part of the roller whichlies in the path of the advancing band on the drum, sheet feeding meansfor advancing sheets from said table to the margin bar, and actuatingmeans for said margin bar operable in timed relation with the drum toplace the bar in position to receive a sheet riding over said guide andsaid platen roller until the sheet has engaged the margin bar and hasbeen pressed by the platen roller against the duplicating band and tothereafter remove the bar from the path of the platen.

9. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path. of said band and adapted to press sheets against the band, amargin bar, arms carrying said bar and pivoted in the frame to swing thebar into and out of operative position in the path of the platen beyondthe platen roller, means to adjust the operative position of said bartoward and away from said platen roller, a copy sheet table on saidframe, a sheet guide on said table extending toward the drum andterminating directly over the platen roller in close proximity to thepath of the platen in position to guide sheets across said roller to themargin bar and to contact the sheets with that part of the roller whichlies in the path of the advancing band on the drum, said sheet guidecomprising upper and lower plates directed diagonally downward andconverging toward the drum, sheet feeding means for advancing sheetsfrom said table to the margin bar, and actuating means for said marginbar operable in timed relation with the drum to place the bar inposition to receive a sheet riding over said guide and said platenroller until the sheet has engaged the margin bar and was been pressedby the platen roller against the duplicating band and to thereafterremove the bar from the path of the platen.

10. A duplicating machine of the character described comprising a frame,a drum journalled herein providing an arcuate platen, a duplicating bandon said platen, a platen roller movably mounted in said frame in thepath of said band and adapted to press sheets against the band, a marginbar, arms carrying said bar and pivoted n the frame to swing the barinto and out of operative position in the path of the platen beyond theplaten'roller, means to adjust the operative position of said bar towardand away from said platen roller, a copy sheet table on said frame, asheet guide on said table extending toward the drum and terminatingdirectly over the platen roller in close proximity to the path of theplaten in position to guide sheets across said roller to the margin barand to contact the sheets with that part of the roller which lies in thepath of the advancing band on the drum, sheet feeding means foradvancing sheets from said table to the margin bar, and actuating meansfor said margin bar operable in timed relation with the drum to placethe bar in position to receive a sheet riding over said guide and saidplaten roller until the sheet has engaged the margin bar and has beenpressed by the platen roller against the duplicating band and tothereafter remove the bar from the path of the platen, said actuatingmeans comprising a cam fixed to the drum at one end thereof and a rollerat one end of the margin bar to engage said cam.

11. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band, amargin bar, arms carrying said bar and pivoted in the frame to swing thebar into and out of operative position in the path of the platen beyondthe platen roller, a copy sheet table on said frame, a sheet guide onsaid table extending toward the drum and terminating directly over theplaten roller in close proximity to the path of the platen in positionto guide sheets across said roller to the margin bar and to contact thesheets with that part of the roller which lies in the path of theadvancing band on the drum, sheet feeding means for advancing sheetsfrom said table to the margin bar, and actuating means for said marginbar operable in timed relation with the drum to place the bar inposition to receive a sheet riding over said guide and said platenroller until the sheet has engaged the margin bar and has been pressedby the platen roll-er against the duplicating band and to thereafterremove the bar from the path of the platen, said sheet guide comprisinga plate curved downwardly from the table and terminating in a portionwhich is substantially tangential to the platen roller at the pointwhere the advancing band first presses the sheets against the platenroller.

12. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band,manually controlled means for moving the platen roller out of the pathof the band, a margin bar, arms carrying said bar and pivoted in theframe to swing the bar into and out of operative position in the path ofthe plat-en beyond the platen roller, a copy sheet table on said frame,a sheet guide on said table extending toward the drum and terminatingdirectly over the platen roller in close proximity to the path of theplaten in position to guide sheets across said roller to the margin barand to contact the sheets with that part of the roller which lies in thepath of the advancing band on the drum, sheet feeding means foradvancing sheets from said table to the margin bar, and actuating meansfor said margin bar operable in timed relation with the drum to placethe bar in position to receive a sheet riding over said guide and saidplaten roller until the sheet has engaged the margin bar and has beenpressed by the platen roller against the duplicating band and tothereafter remove the bar from the path of the platen, said sheet guidecomprising a plate curved downwardly from the table and terminating in aportion which is substantially tangential to the platen roller at thepoint where the advancing band first presses the sheets against theplaten roller.

13. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band, amargin bar, arms carrying said bar and pivoted in the frame to swing thebar into and out of operative position in the path of the platen beyondthe platen roller, a copy sheet table on said frame, a sheet guide onsaid table extending toward the drum and terminating directly over theplaten roller in close proximity to the path of the platen in positionto guide sheets across said roller to the margin bar and to contact thesheets with that part of the roller which lies in the path of theadvancing band on the drum, sheet feeding means for advancing sheetsfrom said table to the margin bar, and actuating means for said marginbar operable in timed relation with the drum to place the bar inposition to receive a sheet riding over said guide and said p1atenroller until the sheet has engaged the margin bar and has been pressedby the platen roller against the duplicating band and to thereafterremove the bar from the path of the platen, said sheet guide comprisinga plate curved dqwnwardly from the table and terminating in a portionwhich is substantially tangential to the platen roller at the pointwhere the advancing band first presses the sheets against the platenroller, and a top plate above said curved plate, said plates convergingtoward the plat-en roller to provide a tapered passage for directingcopy sheets tangentially across the platen roller to the margin bar.

14. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band, amargin bar, arms carrying said bar and pivoted in the frame to swing thebar into and out of operative position in the path of the platen beyondthe platen roller, means to adjust the operative position of said bartoward and away from said platen roller, a copy sheet table on saidframe, a sheet guide on said table extending toward the drum andterminating directly over the platen roller in close proximity to thepath of the platen in position to guide sheets across said roller to themargin bar and to contact the sheets with that part of the roller whichlies in the path of the advancing band on the drum, sheet feeding meansfor advancing sheets from said table to the margin bar, and actuatingmeans for said margin bar operable in timed relation with the drum toplace the bar in position to receive a sheet riding over said guide andsaid platen roller until the sheet has engaged the margin bar and hasbeen pressed by the platen roller against the duplicating band and tothereafter remove the bar from the path of the platen, said sheet guidecomprising a plat-e curved downwardly from the table and terminating ina portion which is substantially tangential to the platen roller at thepoint where the advancing band first presses the sheets against theplaten roller.

15. A duplicating machine of the character described comprising a frame,a drum journalled therein providing an arcuate platen, a duplicatingband on said platen, a platen roller movably mounted in said frame inthe path of said band and adapted to press sheets against the band,manually controlled means for moving the platen roller out of the pathof the band, a margin bar, arms carrying said bar and pivoted in theframe to swing the bar into and out of operative position in the path ofthe platen beyond the platen roller, means to adjust the operativeposition of said bar toward and away from said p1aten roller, a copysheet table on said frame, a sheet guide on said table extending towardthe drum and terminating directly over the platen roller in closeproximity to the path of the platen in position to guide sheets acrosssaid roller to the margin bar and to contact the sheets with that partof the roller which lies in the path of the advancing band on the drum,sheet feeding means for advancing sheets from said table to the marginbar, and actuating means for said margin bar operable in timed relationwith the drum to place the bar in position to receive a sheet ridingover said guide and said platen roller until the sheet has engaged themargin bar and has been pressed by the platen roller 7 against theduplicating band and to thereafter remove the bar from the path of theplaten, said sheet guide comprising a plate curved downwardly from thetable and terminating in a portion which is substantially tangential tothe platen roller at the point where the advancing band first pressesthe sheets against the platen roller, and a top plate above said curvedplate, said plates converging toward the platen roller to provide atapered passage for directing copy sheets tangentially across the platenroller to the margin bar.

16. In a duplicating machine of the character described, the combinationof a frame, a drum rotatably mounted on said frame and cut away at oneside to provide an arcuate platen, means for rotating said drum, meansfor holding a duplicating band wrapped about said platen, a platenroller rotatably mounted on said frame and standing normally in the pathof said platen and movable outward-1y a short distance into pressurerelationship with said platen for pressing a sheet against theduplicating band on the platen as the drum rotates, guiding means fordirecting a sheet fed thereto into position across the face of saidplaten roller, a margin bar movable toward and from the drum adaptedwhen disposed inwardly to engage the leading edge of a sheet fed intoposition opposite to the face of said platen roller for accuratelypositioning the sheet for engagement with said duplicating band, andcontrolling means for said margin bar adapted to hold the margin bardisposed inwardly in operative stopping position until said platen isbrought into pressure relationship with said platen roller and adaptedthereafter to move the margin bar quickly out of the path of the platen.

1'7. In a duplicating machine of the character described, thecombination of a frame, a drum rotatably mounted on said frame and cutaway at one side to provide an arcuate platen, means for rotating saiddrum, means for holding a duplicating band wrapped about said platen, aplaten roller rotatably mounted on said frame and movable toward andfrom the bottom face of the drum at the downwardly moving side of thedrum, yielding means adapted normally to press the platen rollerinwardly into position for operative engagement with said p1aten as thedrum rotates, a margin bar movable toward and from the drum adjacent tosaid platen roller, means for holding said margin bar normally inposition adjacent to the face of said platen roller, guiding means fordirecting a sheet fed thereto into position across the face of saidp1aten roller and into engagement with said margin bar so as to bepositioned thereby, and means actuated in WILHELM F. SCI-IOENHARDT.

